we begin with breaking news on lance armstrong. after years of lying about using performance-enhancing drugs, after suing some, threatening others and ruining the careers of many who tried to expose his lies, the dethroned seven-time tour de france winner has changed his tune. he calls his whole experience, quote, one big lie, and says all the blame lies with him. he spoke, obviously, with oprah winfrey, taped a 2 1/2-hour interview which began airing tonight on her network own. the encounter began with oprah asking him rapid fire questions. the stakes got higher, the tension rose. take a look. >> did you ever take banned substances to enhance your cycling performance? >> yes. >> yes or no, was one of those epo? >> yes. >> did you ever blood dope or use blood transfusions to enhance your cycling performance. did you ever use any other banned substances like testosterone, cortisone or human growth hormone? >> yes. >> yes or no, in all seven of your tour de france victories, did you ever take banned substances or blood dope? >> yes.